Pressure Control Valves

RV52-26 — Relief, Pilot-Operated, High Pressure, Spool-Type Valve

DESCRIPTION
A screw-in, cartridge-style, pilot-operated, two-stage, spool-type hydraulic relief valve,
intended for use as a pressure limiting device in demanding hydraulic circuits which
require fast response and low hysteresis at high operating pressures.

OPERATION
The RV52-26 blocks flow from 1 to 2 until sufficient pressure is present at 1 to force the
pilot relief off its seat, allowing the main stage to shift, opening 1 to 2. The cartridge offers
smooth transition in response to load changes in demanding hydraulic circuitsNote: The RV52-26 cannot be used in cross-over relief applications.

FEATURES
• Adjustments cannot be backed out of the valve.
• Adjustments prohibit springs from going solid.
• Hardened spool and cage for long life.
• Rapid, smooth response to pressure surges.
• Cost-effective cavity.

RATINGSOperating Pressure: 345 bar (5000 psi) maximumFlow: See Performance ChartInternal Leakage: 197 ml/minute (12 cu. in/minute) max. to 85% of nominal settingCrack Pressure Defined: bar (psi) evident at 7.6 lpm (2.0 gpm) attainedReseat Pressure: Nominal 90% of crack pressureStandard Spring Range: 41 to 345 bar (600 to 5000 psi).
Due to manufacturing tolerances, it may be possible to adjust the valve either lower or
higher than the nominal rating shown. If the valve is adjusted beyond the recommended
maximum pressure range for the F and H style adjuster options, the valve may not
open to relieve system pressure.Temperature: -54° to 107°C (-65°F to 225°F) with Polyurethane sealsFiltration: See page 9.010.1Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1Installation: No restrictions; See page 9.020.1Cavity: VC12-2; See page 9.112_2wCavity Tool: CT12-2xx; See page 8.600.1Seal Kit: SK52-2X-B; See page 8.650.1